Device for coating the interior of walls of pipes or conduits



J. STEINNES DEVICE FOVR COATINGTHE INTRIOR OF WALLS OF PIPES OR CONDUITS Filed Feb.I 26. 1927 2 Sheets-Sheet 1 Invnrur MHESSES J.. sTElNNEs 1,787,126

DEVICE FOR COATIG THE INTERIOR 0F WALLS OF PIPES OR CONDUITS Dec. 30, 1930.

Filed Feb. 26. 1927 2 Sheets-Sheet, 2

Invnnr Patentedfnec. 3o,` 1930 UNITED STATES PATENT OFFICE JOHANN STEIN NES, OF OBERHAUSEN, GERMANY .DEVICE IOR OOATING TiHE INTERIOR OF WALLS Ol PIPES R OONDUITS Application filed February 26, 192'?, Serial No. 171,308, and. in Germany Harsh l, 1926.

` This invention relates to a device for coating the interior walls ofi pipes or conduits with a liquid or viscous material such as a paint or corrosive material and in particular 5 to a device, for. treating welded tubes tarred for asphalted on the inside, for` renewing aft/er welding the protective material (tar or asphalt) which has run away from the welded part. A further object'of the device is to enable other operations to be carried out at the point of welding, after said welding, such as for example, cooling, cleaning and pressing the welded part before the protective material isrenewed. The device is characterized principally by a vessel containing the coating material which may be inserted inthe pipe and which is provided with openings closeable from the end of the device, with a device for forcing the material 2 0 out of the vessel and with transversely acting packing means preventing leakage along the inner wall of .the pipe. The device may be operated wholly or in part by a compressed lgaseous medium whichl may also be employed at the same time for cleaning and pressin the parts of the interior of the tube operate upon.

. O ne embodiment of the trated in Figs. 1-3,

Fig. l'being a longitudinal section,

Fig. 2 a cross section on the line A-B in Fig. 1 and Fig. 3 illustrating a detail to a larger scale,

Fig. 4 shows a second embodiment in longiinvention is illusi tudinal section and Fig. 5 another modification also in longitudinal section.

The device illustrated in Figs. 1-3 consists of two tubes a and b, one inside the other,

4 of which the inner tube a is mounted rotatably in the outer tube b by vmeans of roller bearings awhich are arranged at suitable intervals and are forced-resilientlyoutwards. The outer tube b is mounted rotatably in the pipe c, which represents the article tobe coated,zin a similar manner by means of roller `bearings b' also forced resiliently outwards. The tubes a and b consist of separate sections put togetherto make the desired length and .heldtoge'ther by threaded rings d, the sections being prevented from rotating relatively to one another by tongues and grooves c.v Thetwo tubes a and b are connected together by a lthreaded guide member 1' (Fig.` 1). The vessel f furnished with peripheral outlet openings f', with an inlet pipe h and with an overflow or safety valve d is arranged in the length. of ipe a. The length of pipe b is provided witli a vessel g ittin around the vessel f and provided with out et open- 6 ings/g correspondin .to the openings f and with' a peripheralrush q or with strips of material. On etherside of these vessels there are annular cushion members j forced outwardly byk a spiral spring c, (see also Fig. 2) to bear against the inner wall of the tube o. The inner endv of the spring l: is connected to the tube a so that axial rotation of the tube a in one direction releases/ the spring k to press the cushion member j o against the wall c whereas rotation ofthe tube ain the opposite direction draws in the spring c and therewith the cushion member j. One end (the left hand end in the drawing) 'of each of the tubes a and b is closed by a 75 ca b3 or the like while the other end of the tu a is entered by a section of tube m which fits therein in such a manner as to be capable of axial movement, is coupled therewith by a tongue and groove e and is pro- 8 vided with a handle o. A tube n (see Fig. 3) Y for connectiony to a compressedair conduit or the like is fitted rotatably in th'e said section or tube m. i

For use the vessel .f is iilled through the pipe h` with the material to be coated on the vinterior wall c? of the pipe, such as'tar or asphalt, corrosive liquid or paint material and the tubes a and b together with the connecting tubes fm. and n are inserted so far into the pipe c tobe treated that the vessels f, g are situated just before the parts to be provided with coating material, that is for example, just before the welding seam o', to be tarred or asphalted, of the pipe c. Compressed airis then admitted t'o the tubes n, a which emerging from the tubes a and b at p and p', cools if necessary the weld c and blows away any dirt situated at the part c Y to be treated. After this the device is further inserted in the tube c until the vessels 1g. 1, namely, opposite to the part c of the tube o to be treated with coating mateguide r in the tube b in the direction of the l arrow in Fig. 1 until the holes f of the vessel f register with those g ofthe vessel g. By

lthis axial movement ofthe tube a the openings p are furthermore closed by a ring t mounted on the tube b. The compressed air emerging at s and s from` thetube a into the vessel f, pressing at the same time on the cushion member j, forces the coatingf material out from f and g and into the brush q. Next the tube m' is moved so far into the tube b that the handle-0 engages in a recess y' in the tube b, the tube b then being turned by means of the handle o so that the brush g is rotated and the material coated on the interior of the tubex c with the assistance of the compressed air. When this has been effected the superfluous material may be drawn back into the vessel f by -means of an ,air pump, jet exhauster or the like connected to 'n whereupon the tube a is screwed back in the opposite direction to the arrow (Fig.` 1), the vessel f being-re-closed and the cushion members y' drawn in once more so that the entire device may 'be removed yfrom the pipe c. If the coating material is to be heated the vessel f may also be provided with a heating device.

In the modification of the device illustrated in Fig. 4 the coating material is forced out from the vessel f by means of a piston instead of by a gaseous pressure medium. For this purpose the vinner tube a' is fur-y nished with a piston u. This device is em ployed as follows:

The vessel is, similarly to the device illustrated in Figs. 1-3, filled with the material to be coated upon the inner wall c of the pipe and the device is immediately 'inserted so far lnto the tube c that the passages f', g are situated opposite to the part 'c' of the tube c to be furnished with coating material. Com- -pressed air or the like is then admitted to the tube a, said air' emerging through the openings p in the tube a and the openings v' 1n thetube b into the annular space c* between the vessel g and the tube c thus cleansing the part c of tube to be coated. The tube ais next'rotated by lmeans of the handle o (not illustrated) whereby the tube ais' displaced, due to the threaded guide r, in the tube b in i the direction of the arrow in Fig. 4. Since at first the openings f of the vessel f are still and g are in the position illustrated in`` closed the vessel f is moved in the direction of the arrow in 4 until it arrives at the end, in the direction f the arrow,'of the outer vessel g.' The openin s f and g register in this'position 'and on urther rotation of the the annular space c4 situated between the tube q g and the pipe c. As before the said annular space is closed at the sides and tightly packed by rings j which in the present example are pressed against the inner wall c of the pipe, not by springs under compression, but by their own resilience assisted by the --compressed air from a acting on themtfrom the inside. When the space c* has been filled with the material forced out from f, the said material thus )exerting pressure on the pipe por# tion o', remaining material not employed is drawn back into the vessel f with t e aid of an air pump ofthe like connected to the outer end of the tube a. The tube ais then rotated in the opposite direction to what it was be'- fore or drawn back-whereby the piston u is again moved into the vessel f in a direction opposite to that of the arrow, thus rforcing the vessel f by means of abutments u1 into its original position, closing the openings f1. The entire device may then be removedagain from the tube o.

If compressed air is left to a'ct on the tube a such com ressed air, when the tube is in the position lustrated in Fig. 4, discharges out of the port z into `the annular space c4, pressure not yet being exerted on the rings j', and blows out through the joint c cleaning the same. When the tube is moved a little in -f h* is an inwardly opening check valve, which as soon as the receptacle f 1s returned to the position shown in Fig. 4, allows the surplus .of the coating material to be suckedv back into such receptacle.

The opening z upon axial displacement of the central tube a comes into register with the opening z2, then the opening e in tube a' will register with the opening z'f in the tube b,

and consequently the compressed air-in the` tube a passes through openings z and z2 against the lower packing ring j', and through the openings e and z* against the upl per packing ring j', so that, both rings are pressed outwardly simultaneously. The plate coupled therewith'by'means'of a member af' 'lnear et is fixed-to `receptacle g and its pur--v is to revent the passage of airfrom' the cylindri'ca -space 'formed between-the tube a andthe upper 'tube 71' upon the'opening z3 beingso A iispo'sedasto admit airto this cylin- Ztube b'with the vessel g is effected in the` present case by bringing oriices in the tubes a.

bache after another into register, wherevuponthe pressure agent, emerging through these outlets, 'secures the tube b2 with the vessel-g in thepipec, exerts pressure on the part to be operated upon and forces the coatingmaterial .out from -the' vessels f, g. The tube b2 is furnished as before with ball bearings b1 and Withexpansible' packing rings jlon either side of the vessel g. Within each of these packing rings the' tube b2 is provided Withone' or more non-return valves 'wl open towards the expansible rings and with valves te which 'are released from their seats when .the tube 'a rotated relatively to the'tube b2 l"tofsiich an 1extent zthat Aan opening fw in the tubeal comes beneath the'valves wz. The tube sectionj b2 'is further 'previded with a'n-outlet openingpj" "discharging into the annular ""'s'pa'ce betweenthe expansible packing membersj1 andcoveredbyja mesh screen. As in the modication described above the vessel f 'contains `ja piston a5, which, in the present case, is 'displaceable axially in the vessel f lagainst the pressure of a spring a. For the `purpose 'of 4being rotated or displacedtogether 'witlithe tube' a the piston u nnay be 'ffany suitable type.- The tubes a and b2 are coupled aj pin a4, inthe-tube engaging in" ,',a stepped member "b on the tube b2 or yiever'Sa, in such a manner that they may rotated "relatively' te one anotherA and moved axially relatively to one another in l 1.' `Ste' i' The' tube' b2 isf provided furthermore "i it one5 o .rfmor'e outlet orifices p4 which are, bjc.. present' caseg'cvered by non-return .es wgjIn thejoriginal positions of the b2, illustrated in the drawing, the

ominunicate'with the registering thetubeam'nd b3, in the tube 2 "f" r the pressure agent. The pressure agent' fen'terin'gthrough' 'a is conducted thoughthefpassagesa, b3 under a ring b5 s"supportingthe b'allsbl.' If therefore the tube dirs" subjected to pressure, 'for Aexample by means of. a hand airpump, the pressure agent first of ."all .forces ','by"means `of the rmg or -4 'iings'btxthe .ba-115; lo'elnri1-1g.01i bearmgs b1 Securelyfagainst thewall 'of the-'pipe c, forces "ry' 'thligl 'fthe `valve fw? cm1A ilqws kthrough''thepip'e23,"thus' cooling and cleanmg the welded part c1.A For this purpose the device may either have been moved forwardto the part c1 to becoated or may be situated atv a' distance therefrom; in the latter' case the bal1s'b1'jare,after-the part c1 has been cooled, moved forward, under the pressure acting thereon,v in the pipe c to the position illustrated, vthus removing therefrom any dirt which has collected on the wall of the pipe. The tube a is next rotated relatively to the pipe b2, secured by the ball-bearings b1, to such an extent that the openings w3 in the tube a (position I) register with the passages 'w1 in the tube b?, the openings a3, b3 being, however, not yet entirely covered. The packing rings 7'1- are forced outwardly by the pressure agent entering at a and thus pack the operating space c4.

'After the packing rings jl have been expanded by the pressure agent emerging from w1, the tube a controlled by the guide a4, b* may be moved axiallyfrom the position, relatively to the tube b2, illustrated in Figure 5 in the direction of the arrow in Figure 5 (position II) and rotated tangentially relatively to the tube b2 until the opening "wsin the tube @registers with the outlet orilice p5. The pressure agent passes into the annular space c* between c, q and the packing members j* and subjects the said space to pressure sothat any leakages at the weld' c1 maybe observed. After said weld has been subjected to pressure anoutlet, not illustrated, at the outer end of the tube a, is opened and the air at the weld c* released. The tube a is then displaced axially in the tube b until (position III) its orifice wa is inside the vessel f.

infwhich position the piston u is coupledV by the member a with the tube a and thereupon the vessel f `is rotated b v means of the pistn u, which is connected therewith `by said member u, as far as' a stop f2 on the vessel g. The opening or openings fand vg1 of the vessels f and g are thereby brought into register. The piston uis` then moved forward against the force ofthe 'spring z either by the pressure agent enteringthrough a pr. if there is suiiicient space-in" the pipe c, by further movement of the tube a, or by 'both means, so that the contents of the'vessel' f is forced 'into the annular space e. When thespace c* has thus 'filled' with coat- 'ingmateriah the tube ais drawn back axial- .1y in a direction opposite to the arrow under the control'of the members a, b, and is rotatedtangentially. The pressure agent hav-` ing been released the piston u. moves back under the lpressure'of the-spring z', th'e re- 'maining unused material-being drawn back- -into the vessel f. When the opening w again arrives in the position I, Vthe tube a is rotated until the opening rw3 registers with the valve wz, thus releasing the expansible packring jl, since the pressure agent acting there-4 means controlled from an end of the pipe for regulatingthe outlet orifices in said vessel and for ejecting the coating material from the latter, and a piston adapted to be moved from the end of the pipe longitudinally of the vessel to eject the coating material therefrom.

2. A device for coating the interior surfaces of pipes or conduits with paint, in-

sulating material, corrosive substance or the like, comprising in combination, a vessel provided with outlet orifices and adapted to be inserted containing said coating material,

means controlled from an end of the pipe fon regulating the outlet orifices in 'said vessel and for ejecting the coating material from the latter, a piston adapted to be moved from the end of the pipe longitudinally of the veissel to eject the coating material therefrom, and springs opposing the piston'in one direction.

3. A device for coating-the interior surfaces of pipes or conduits with paint, insulating material, corrosive substance or the like, comprising in combination, a vessel provided with outlet orifices and adapted to be inserted containing said coating material, means controlled from an end of the pipe for regulating the outlet orifices in said vessel and for ejecting the coating material from the latter, a tube extending from the part of the pipe to -be treated at least to one end thereof for supplying a'gaseous pressure agent to the vessel, and having outlet orifices therein for supplying the gaseous pressure agent from such tube into the pipe, said openings regulable from the end of said pipe.

.4. A device for coating the interior surfaces of pipes 'or conduits with paint, insulating material, corrosive substance or the like, comprising in combination, a vessel provided with outlet orifices and adapted to be inserted containing said! coating material,

means controlled from an end of the pipe forl regulating the outlet orifices in said vessel 'and for ejectin the coating material from the latter, a tu e extending from the part of the pipe to be treated at least to one end thereof for supplying a gaseous pressure agent to the vessel, and expansible packing rings on each side of and between the vessel and the pipe, said tube having outlet orifices for conveying lthe pressure agent to the expansible packing rings for packing the vessel against the pipe.

5. A. device for coating the interior sur- A faces of pipesor conduits with paint, insulatsel and for ejecting the coating material from the latter, a tube extending from the part of the pipe to be treated at least to one end thereof for supplying a gaseous pressure agent to the vessel, and expansible packing rings on each side of and betweensaid vessel and the pipe, said tube having outlets adapted to open in succession, the opening of the first admitting lthe pressure agent to the pipe, the opening of the second admitting the pressure agent to the expansible packlng rings, and the opening of the remaining outlets allowing the pressure agent to enter the vessel.

6. A device for coating the interior surfaces of pipes or conduits with paint, insulating material, corrosive substance or the like, comprising in combination, a vessel provided with outlet orifices `and adapted to be inserted containin said coating material, means controlled rom an end of the pipe for regulating the outlet orifices in said vessel and for ejecting the coating material from the latter, a piston displaceable in the vessel to eject the coating material therefrom in combination with a tubefor supplying a gaseous pressure agent acting on the' piston in one of its directions of movement.

7. A device for coating'y the interior surfaces of pipes or conduits'with paint, insulating material, corrosive substance or the like, comprising in combination, a vessel provided with outlet orifices and adapted to be inserted containing said coating material, means controlled from an end of the pipe for regulating the outlet orifices in said vessel and for ejecting the coating material from the latter, a tube extending from the artof the pipe to be treated at least to one en thereof for supplying a aseou's'pressure agentto the vessel, expansible packing rings on each side of and between said vessel and the pipe, said tube having -outlets ada ted .to open in succession, the opening of t e first admitting the pressure agent to thepipe, the open-A ing of the second admitting the pressure agent to the expansible packing rings, and the opening of the remaining outlets allowing the pressure agent to enter the vessel,r and a piston displaceable in the vessel to leject coating material' therefrom, the lgaseous pressure agentsupplied through the tube acting on the piston in one of its directions of movement. i

8. A device for conti the interior surfaces of pipes or conduits withV paint, insulating material, corrosive lsubstance or the like, comprising" in combination, a vessel provided with loutlet, orifices and adapted to means controlled from an` end o the pipe for regulating the outlet orifices in said vessel and-for ejecting the coating material from the latter, a tube extending from the part of the pipe to be treated at least to one end thereof for supplying a gaseous pressure agent to the vessel, packing means,-

` on each side of and between the vessel and the pipe,` said packing means being rendered operative and inoperative by the movement of the tube.

9. A device for coating the interior surfaces of pipes or conduits" with paint, insulating material, corrosive substance or the like, comprising in combination, a vessel provided witloutlet orifices and adapted to be inserted *containing said coating material, means-controlled from an end of theA pipe for regulating the outlet orifices in said vesf sel. and lfor ejecting the coating material from the latter, a tube extending from the part of the; pipe to be treated at least to one end thereof Yfor supplying a gaseous pressure agent to the vessel, and means for guiding the device on the inner wall of the pipe.

10. A device for coating the interior sur'- vfaces of pipes orl conduits with paint, in-

s ulating material, corrosive substance or the like, comprisin in combination, a vessel provided with out et orifices and adapted to be inserted' containing saidcoating material,

Y means controlled from an end of the pipe for regulating the outlet orifices in said vessel and for 4ejectin kthe coating'material from the latter, a tu extending from the part of the ipe to'betreated at least to one end thereof or supplying a seous pressure agent to the"vessel,.said tu e having pressure agent outlets thereimand means movable relatively 'tofthe'tube'by the displacement of which the outletstherein are opened and closed.

. inserted containing.

-means controlled 'n movable re 11.1 A deyice for coating the interior surfaces of pipes or conduits with paint, in-

Y s ulating material, corrosive substance or the hke, comprising in combination, a vessel provided witli' outlet torifices 'and adapted lto be said coating material, n om an end of'the pipe for regulating the outlet orifices in said v essel and `for ejectingthe coating material `from the latter, a tube extendin Y from the part of the to be treated at east to one end ,thereofor sure agent to the vessel,- said tube having pressure .agent outlets therein, and" means atively to the tube by the displacementof which the voutlets therein and in ftheves'sel are opened and closed..

` 12.5A devicefor coating the interior sur# facesof pipes or conduits with paint, ins ulating material, corrosive substance or the like, comprising incombination, a vessel proyided with out etorices and adapted to be means controlled .from an'end of the pipe for regulating the outlet orifices inv saidves'- of the pipe to be treated at least -to one end thereof tor supplying a gaseous pressure agent to the vessel, said tubehaving pressure agent outlets therein, and tubular means movable relatively to the tube by the -displacement of which the outlets therein are opened and closed. .n f

13. A device forcoating the interior surfaces of pipes or conduits with paint, insulating material, corrosive :substance or the like, comprising in combination, a vessel provided with outlet orifices and adapted to be inserted contaiin said coating material, means controlled rom an end of the pipe for regulating the outlet orifices in said vessel'and for ejecting the coating material from the latter, a tube extending from the part of the i e to be treated at least to one end thereo or supplying a gaseous pressure agent to the vessel, said tube having pressure agent outlets therein, and tubular means movable relatively tothe tube by the displacement of which the outlets therein and in the vessel are opened and closed.

In testimony whereof, I have signed my naine to this specification.

JOHANN STEINNES.

supplying a. gaseous prescontaining said lcoating' material,

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